20 questions on "BGP Routing Policies - Foundation Summary - Command Reference"

What is the command mode and desciption of
bgp bestpath med confed?
BGP mode; tells the router to consider
MED for choosing routes through different
confederation sub-ASs
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What is the command mode and desciption of
bgp bestpath med missing-as-worst?
BGP mode; resets the default MED from 0 to
the maximum (232 – 1)
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What is the command mode and desciption of
bgp default local-preference number?
BGP mode; sets the default LOCAL_PREF
value
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What is the command mode and desciption of
bgp deterministic-med?
BGP mode; tells IOS to process MED logic
based on neighboring AS, rather than on the
order in which the routes were learned
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What is the command mode and desciption of
bgp maxas-limit number?
BGP mode; tells the router to discard routes
whose AS_PATH length exceeds this setting
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What is the command mode and desciption of
distribute-list acl-number | prefix list-name in | out?
BGP mode; defines a BGP distribution list
(ACL or prefix list) for filtering routes
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What is the command mode and desciption of ip bgp-community new-format?
Global config; tells IOS to display and
interpret the COMMUNITY PA in the RFC
1997 format, AA:NN
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What is the command mode and desciption of
ip community-list { standard | standard listname
{ deny | permit } [ community-number ]
[ AA : NN ] [ internet ] [ local-AS ] [ no-advertise ]
[ no-export ]} | { expanded | expanded listname
{ deny | permit } regexp }?
Global config; creates entries in a community
list used in matching existing COMMUNITY
values
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What is the command mode and desciption of
neighbor { ip-address | peer-group-name }
local-as as-number [ no-prepend ]?
BGP mode;
Defines an alternate ASN to be prepended in the AS_PATH of sent eBGP Updates, instead of the ASN listed in the router bgp command
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What is the command mode and desciption of
neighbor { ip-address | peer-group-name } prefix-list { prefix-list-name | clns-filterexpr-name | clns-filter-set-name } { in | out }?
BGP mode; identifies an IP prefix list used to
filter NLRIs being sent to or received from
the neighbor
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What is the command mode and desciption of neighbor { ip-address | peer-group-name } remove-private-as?
BGP mode; used with eBGP peers, removes any private ASNs from the AS_PATH under certain conditions
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What is the command mode and desciption of
neighbor ip-address route-reflector-client?
BGP mode; used on the RR server, identifies a neighbor as an RR client
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What is the command mode and desciption of
neighbor { ip-address | peer-groupname} send-community [ both | standard | extended?
BGP mode; causes the router to include the COMMUNITY PA in Updates sent to this neighbor
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What is the command mode and desciption of
neighbor { ip-address | peer-group-name } unsuppress-map route-map-name
BGP mode; allows a router to identify previously suppressed routes and no longer suppress them
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What is the command mode and desciption of
network ip-address backdoor
BGP mode; identifies a network as a backdoor route, considering it to have the same administrative distance as iBGP routes
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What is the command mode and desciption of
show ip bgp regexp regexp
EXEC mode; displays BGP table entries whose AS_PATH PA is matched by the stated regex
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What is the command mode and desciption of
show ip community-list [ standardcommunity-list-number | extendedcommunity-list-number | community-listname] [ exact-match ]
EXEC mode; lists the contents of configured IP community lists
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What is the command mode and desciption of
show ip bgp community communitynumber [ exact ]
EXEC mode; lists BGP table entries that include the listed COMMUNITY
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What is the command mode and desciption of
show ip bgp filter-list access-list-number
EXEC mode; lists the contents of AS_PATH access lists
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What is the command mode and desciption of
neighbor ip-address fall-over [ route-map map-name ]
BGP mode; eBGP session between directly connected eBGP neighbors will be torn down the moment the connected subnet between the peers is lost
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